Visual conflict and cognitive load modify postural responses to vibrotactile noise.
Visual conflict and cognitive load modify postural responses to vibrotactile noise.
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视觉冲突和认知负荷修改了对颤音噪声的姿势反应。
DOI：
10.1186/1743-0003-11-6
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发表时间：
2014-01-13
影响因子：
5.1
通讯作者：
Darvish K
中科院分区：
文献类型：
--
作者：
Keshner EA;Slaboda JC;Day LL;Darvish K
多任务处理过程中福尔斯发生率增加的潜在原因是检测或关注姿势不稳定的感觉信息的能力降低。向生物系统添加噪声已经被证明可以增强对减弱的或亚阈值皮肤信号的检测和传输。如果随机共振是成为一个有效的辅助康复，我们需要确定是否可以有效的振动触觉噪声时，添加到环境中呈现其他感官噪声。在两个30秒的无振动期间，对21名健康成年人（20-29岁）的脚底施加亚阈值振动噪音30秒。在试验过程中，受试者安静地站着，闭上眼睛，或同时观看以30度/秒的连续向上俯仰旋转的视觉场景。受试者在执行心算任务时还接受了这两种视觉条件的测试。据推测，阈下振动将增加姿势摇摆的规律性，从而提高姿势稳定性在一个注意力要求的任务，但施加多个感官需求的影响较小。对协方差矩阵的椭圆拟合揭示了前后平面和侧面的压力中心（COP）和质心（COM）响应的偏移。计算COP和COM的RMS值和近似熵，并进行统计学比较。另外，在安静的立场与闭上眼睛的足底表面的振动触觉噪声减少了COM和COP的反应，然后恢复到振动前的水平后，振动被删除的面积。与闭眼条件相比，视野旋转和心算都会增加姿势摇摆。当视野旋转和心算相结合时，阈下振动噪声对姿势行为的影响被修正。结果表明，近似熵的度量反映了任务复杂性的增加。我们的研究结果表明，不稳定信号的影响调制时，结合振动触觉刺激。振动刺激的强烈后效表明，即使在这里测试的短时间内，该系统也已经适应了感觉阵列。结果表明，振动触觉刺激的应用有可能减少摇摆幅度，同时增加反应变异性的可能性，从而提出了一种非侵入性的方法，减少了福尔斯的可能性。
Underlying the increased incidence of falls during multitasking is a reduced ability to detect or attend to the sensory information signaling postural instability. Adding noise to a biological system has been shown to enhance the detection and transmission of weakened or sub-threshold cutaneous signals. If stochastic resonance is to become an effective adjunct to rehabilitation, we need to determine whether vibrotactile noise can be effective when added to an environment presenting with other sensory noise. Sub-threshold vibration noise was applied for 30 sec at the soles of the feet in 21 healthy adults (20–29 yrs) between two 30-sec periods of no vibration. During the trials, subjects stood quietly with eyes closed or while viewing a visual scene that rotated in continuous upward pitch at 30 deg/sec. Subjects were also tested with these two visual conditions while performing a mental calculation task. It was hypothesized that sub-threshold vibration would increase regularity of postural sway, thereby improving postural stabilization during an attention demanding task but exerting less effect with multiple sensory demands. An ellipse fit to the covariance matrix revealed excursion of center of pressure (COP) and center of mass (COM) responses in the anterior-posterior and lateral planes. RMS values and approximate entropy of the COP and COM were calculated and statistically compared. The addition of vibrotactile noise to the plantar surface during quiet stance with eyes closed reduced the area of the COM and COP responses, which then returned to pre-vibration levels after vibration was removed. Postural sway was generally increased with both visual field rotations and mental calculation compared to the eyes closed condition. The effect of sub-threshold vibratory noise on postural behavior was modified when visual field rotations and mental calculation was combined. It was shown that the measure of approximate entropy reflected increased task complexity. Our results suggest that the impact of destabilizing signals is modulated when combined with vibrotactile stimulation. The strong aftereffects of the vibration stimulus suggest that the system has adapted to the sensory array even in the short time period tested here. The results imply that application of vibrotactile stimulation has the potential for diminishing sway magnitudes while increasing the potential for response variability, thereby presenting a non-invasive method of reducing the potential for falls.
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影响因子：
5.1
作者：
Cavanaugh, James T.;Mercer, Vicki S.;Stergiou, Nicholas
通讯作者：
Stergiou, Nicholas
影响因子：
4
作者：
Lajoie, Y;Gallagher, SP
通讯作者：
Gallagher, SP
影响因子：
3.3
作者：
Sozzi, S.;Do, M. -C.;Schieppati, M.
通讯作者：
Schieppati, M.
DOI：
10.1523/jneurosci.1013-11.2011
发表时间：
2011-10-19
期刊：
The Journal of neuroscience : the official journal of the Society for Neuroscience
影响因子：
--
作者：
Kiemel T;Zhang Y;Jeka JJ
通讯作者：
Jeka JJ
影响因子：
2.9
作者：
Gurses, S;Dhaher, Y;Keshner, EA
通讯作者：
Keshner, EA